Why is the percent ice cover significant for eagles obtaining food?

The significance of percent ice cover for eagles in relation to their ability to obtain food primarily revolves around the availability of fish, which is a critical component of their diet. When ice cover is extensive, it limits the access eagles have to open water where they can hunt for fish. As ice increases, fewer fishing opportunities arise because fish are less accessible. Conversely, reduced ice cover expands the areas where fish can be found, making it easier for eagles to find and catch their prey. This relationship highlights how environmental conditions directly influence the food supply for eagles and consequently their overall survival and reproductive success.